The addition of a retractable
centerboard made it possible to raise a small mast and sail over a canoe-shaped
hull. This breakthrough probably took place some time in the late 17th century or early 18th century at the
Straits of Mackinac, hence the name,
Mackinaw boat. With the help of a sail and a favorable wind, a Mackinaw boat could cover an equivalent distance with much greater ease than by rowing with
paddles. The Mackinaw boat quickly became a favorite on the upper Great Lakes. By the time of the dominance of the
American Fur Company in 1815–1836, the Mackinaw boat was almost the commodity vessel in this region. The
bateau was another common freight vessel design of the era, similar to the Mackinaw. The fur company's men so liked the Mackinaw boat that when asked to build, paddle, and pole light cargo boats up the Missouri River to the company's new trading region in
Dakota Territory and
Montana Territory, they called the boats
mackinaws, even though it was comparatively difficult to move a boat up the Missouri River by sail power. The Missouri River
mackinaw may have borne some similarities to the river
pirogue developed by French colonists in
Louisiana Territory and adapted by the Americans as early as the time of
Lewis and Clark.
Mackinaws were seen on the Missouri River as far west as
Fort Benton, Montana, the head of navigation. ==Fishing boat==